期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 4, 页码 1029-1034出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1114672109
关键词
fuel cells; Nafion (R) degradation; hydroxyl radicals; hydroperoxyl radicals; miniature fluorescence probe
资金
- National Science Foundation [0756473]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0756473] Funding Source: National Science Foundation
A fluorescent molecular probe, 6-carboxy fluorescein, was used in conjunction with in situ fluorescence spectroscopy to facilitate real-time monitoring of degradation inducing reactive oxygen species within the polymer electrolyte membrane (PEM) of an operating PEM fuel cell. The key requirements of suitable molecular probes for in situ monitoring of ROS are presented. The utility of using free radical scavengers such as CeO2 nanoparticles to mitigate reactive oxygen species induced PEM degradation was demonstrated. The addition of CeO2 to uncatalyzed membranes resulted in close to 100% capture of ROS generated in situ within the PEM for a period of about 7 h and the incorporation of CeO2 into the catalyzed membrane provided an eightfold reduction in ROS generation rate.
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